Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[kernel.git] / net / mac80211 / mlme.c
1 /*
2  * BSS client mode implementation
3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4  * Copyright 2004, Instant802 Networks, Inc.
5  * Copyright 2005, Devicescape Software, Inc.
6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34 #define IEEE80211_MAX_PROBE_TRIES 5
35
36 /*
37  * beacon loss detection timeout
38  * XXX: should depend on beacon interval
39  */
40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
41 /*
42  * Time the connection can be idle before we probe
43  * it to see if we can still talk to the AP.
44  */
45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
46 /*
47  * Time we wait for a probe response after sending
48  * a probe request because of beacon loss or for
49  * checking the connection still works.
50  */
51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
52
53 #define TMR_RUNNING_TIMER       0
54 #define TMR_RUNNING_CHANSW      1
55
56 /*
57  * All cfg80211 functions have to be called outside a locked
58  * section so that they can acquire a lock themselves... This
59  * is much simpler than queuing up things in cfg80211, but we
60  * do need some indirection for that here.
61  */
62 enum rx_mgmt_action {
63         /* no action required */
64         RX_MGMT_NONE,
65
66         /* caller must call cfg80211_send_rx_auth() */
67         RX_MGMT_CFG80211_AUTH,
68
69         /* caller must call cfg80211_send_rx_assoc() */
70         RX_MGMT_CFG80211_ASSOC,
71
72         /* caller must call cfg80211_send_deauth() */
73         RX_MGMT_CFG80211_DEAUTH,
74
75         /* caller must call cfg80211_send_disassoc() */
76         RX_MGMT_CFG80211_DISASSOC,
77
78         /* caller must tell cfg80211 about internal error */
79         RX_MGMT_CFG80211_ASSOC_ERROR,
80
81         /* caller must call cfg80211_auth_timeout() & free work */
82         RX_MGMT_CFG80211_AUTH_TO,
83
84         /* caller must call cfg80211_assoc_timeout() & free work */
85         RX_MGMT_CFG80211_ASSOC_TO,
86 };
87
88 /* utils */
89 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
90 {
91         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
92 }
93
94 /*
95  * We can have multiple work items (and connection probing)
96  * scheduling this timer, but we need to take care to only
97  * reschedule it when it should fire _earlier_ than it was
98  * asked for before, or if it's not pending right now. This
99  * function ensures that. Note that it then is required to
100  * run this function for all timeouts after the first one
101  * has happened -- the work that runs from this timer will
102  * do that.
103  */
104 static void run_again(struct ieee80211_if_managed *ifmgd,
105                              unsigned long timeout)
106 {
107         ASSERT_MGD_MTX(ifmgd);
108
109         if (!timer_pending(&ifmgd->timer) ||
110             time_before(timeout, ifmgd->timer.expires))
111                 mod_timer(&ifmgd->timer, timeout);
112 }
113
114 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
115 {
116         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
117                 return;
118
119         mod_timer(&sdata->u.mgd.bcn_mon_timer,
120                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
121 }
122
123 static int ecw2cw(int ecw)
124 {
125         return (1 << ecw) - 1;
126 }
127
128 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
129                                       struct ieee80211_supported_band *sband,
130                                       u32 *rates)
131 {
132         int i, j, count;
133         *rates = 0;
134         count = 0;
135         for (i = 0; i < bss->supp_rates_len; i++) {
136                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
137
138                 for (j = 0; j < sband->n_bitrates; j++)
139                         if (sband->bitrates[j].bitrate == rate) {
140                                 *rates |= BIT(j);
141                                 count++;
142                                 break;
143                         }
144         }
145
146         return count;
147 }
148
149 /*
150  * ieee80211_enable_ht should be called only after the operating band
151  * has been determined as ht configuration depends on the hw's
152  * HT abilities for a specific band.
153  */
154 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
155                                struct ieee80211_ht_info *hti,
156                                const u8 *bssid, u16 ap_ht_cap_flags)
157 {
158         struct ieee80211_local *local = sdata->local;
159         struct ieee80211_supported_band *sband;
160         struct sta_info *sta;
161         u32 changed = 0;
162         u16 ht_opmode;
163         bool enable_ht = true, ht_changed;
164         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
165
166         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
167
168         /* HT is not supported */
169         if (!sband->ht_cap.ht_supported)
170                 enable_ht = false;
171
172         /* check that channel matches the right operating channel */
173         if (local->hw.conf.channel->center_freq !=
174             ieee80211_channel_to_frequency(hti->control_chan))
175                 enable_ht = false;
176
177         if (enable_ht) {
178                 channel_type = NL80211_CHAN_HT20;
179
180                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
181                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
182                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
183                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
184                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
185                                 if (!(local->hw.conf.channel->flags &
186                                     IEEE80211_CHAN_NO_HT40PLUS))
187                                         channel_type = NL80211_CHAN_HT40PLUS;
188                                 break;
189                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
190                                 if (!(local->hw.conf.channel->flags &
191                                     IEEE80211_CHAN_NO_HT40MINUS))
192                                         channel_type = NL80211_CHAN_HT40MINUS;
193                                 break;
194                         }
195                 }
196         }
197
198         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
199                      channel_type != local->hw.conf.channel_type;
200
201         local->oper_channel_type = channel_type;
202
203         if (ht_changed) {
204                 /* channel_type change automatically detected */
205                 ieee80211_hw_config(local, 0);
206
207                 rcu_read_lock();
208                 sta = sta_info_get(sdata, bssid);
209                 if (sta)
210                         rate_control_rate_update(local, sband, sta,
211                                                  IEEE80211_RC_HT_CHANGED);
212                 rcu_read_unlock();
213         }
214
215         /* disable HT */
216         if (!enable_ht)
217                 return 0;
218
219         ht_opmode = le16_to_cpu(hti->operation_mode);
220
221         /* if bss configuration changed store the new one */
222         if (!sdata->ht_opmode_valid ||
223             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
224                 changed |= BSS_CHANGED_HT;
225                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
226                 sdata->ht_opmode_valid = true;
227         }
228
229         return changed;
230 }
231
232 /* frame sending functions */
233
234 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
235                                  struct ieee80211_mgd_work *wk)
236 {
237         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
238         struct ieee80211_local *local = sdata->local;
239         struct sk_buff *skb;
240         struct ieee80211_mgmt *mgmt;
241         u8 *pos;
242         const u8 *ies, *ht_ie;
243         int i, len, count, rates_len, supp_rates_len;
244         u16 capab;
245         int wmm = 0;
246         struct ieee80211_supported_band *sband;
247         u32 rates = 0;
248
249         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
250                             sizeof(*mgmt) + 200 + wk->ie_len +
251                             wk->ssid_len);
252         if (!skb) {
253                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
254                        "frame\n", sdata->name);
255                 return;
256         }
257         skb_reserve(skb, local->hw.extra_tx_headroom);
258
259         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
260
261         capab = ifmgd->capab;
262
263         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
264                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
265                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
266                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
267                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
268         }
269
270         if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
271                 capab |= WLAN_CAPABILITY_PRIVACY;
272         if (wk->bss->wmm_used)
273                 wmm = 1;
274
275         /* get all rates supported by the device and the AP as
276          * some APs don't like getting a superset of their rates
277          * in the association request (e.g. D-Link DAP 1353 in
278          * b-only mode) */
279         rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
280
281         if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
282             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
283                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
284
285         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
286         memset(mgmt, 0, 24);
287         memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
288         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
289         memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
290
291         if (!is_zero_ether_addr(wk->prev_bssid)) {
292                 skb_put(skb, 10);
293                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
294                                                   IEEE80211_STYPE_REASSOC_REQ);
295                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
296                 mgmt->u.reassoc_req.listen_interval =
297                                 cpu_to_le16(local->hw.conf.listen_interval);
298                 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
299                        ETH_ALEN);
300         } else {
301                 skb_put(skb, 4);
302                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
303                                                   IEEE80211_STYPE_ASSOC_REQ);
304                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
305                 mgmt->u.assoc_req.listen_interval =
306                                 cpu_to_le16(local->hw.conf.listen_interval);
307         }
308
309         /* SSID */
310         ies = pos = skb_put(skb, 2 + wk->ssid_len);
311         *pos++ = WLAN_EID_SSID;
312         *pos++ = wk->ssid_len;
313         memcpy(pos, wk->ssid, wk->ssid_len);
314
315         /* add all rates which were marked to be used above */
316         supp_rates_len = rates_len;
317         if (supp_rates_len > 8)
318                 supp_rates_len = 8;
319
320         len = sband->n_bitrates;
321         pos = skb_put(skb, supp_rates_len + 2);
322         *pos++ = WLAN_EID_SUPP_RATES;
323         *pos++ = supp_rates_len;
324
325         count = 0;
326         for (i = 0; i < sband->n_bitrates; i++) {
327                 if (BIT(i) & rates) {
328                         int rate = sband->bitrates[i].bitrate;
329                         *pos++ = (u8) (rate / 5);
330                         if (++count == 8)
331                                 break;
332                 }
333         }
334
335         if (rates_len > count) {
336                 pos = skb_put(skb, rates_len - count + 2);
337                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
338                 *pos++ = rates_len - count;
339
340                 for (i++; i < sband->n_bitrates; i++) {
341                         if (BIT(i) & rates) {
342                                 int rate = sband->bitrates[i].bitrate;
343                                 *pos++ = (u8) (rate / 5);
344                         }
345                 }
346         }
347
348         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
349                 /* 1. power capabilities */
350                 pos = skb_put(skb, 4);
351                 *pos++ = WLAN_EID_PWR_CAPABILITY;
352                 *pos++ = 2;
353                 *pos++ = 0; /* min tx power */
354                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
355
356                 /* 2. supported channels */
357                 /* TODO: get this in reg domain format */
358                 pos = skb_put(skb, 2 * sband->n_channels + 2);
359                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
360                 *pos++ = 2 * sband->n_channels;
361                 for (i = 0; i < sband->n_channels; i++) {
362                         *pos++ = ieee80211_frequency_to_channel(
363                                         sband->channels[i].center_freq);
364                         *pos++ = 1; /* one channel in the subband*/
365                 }
366         }
367
368         if (wk->ie_len && wk->ie) {
369                 pos = skb_put(skb, wk->ie_len);
370                 memcpy(pos, wk->ie, wk->ie_len);
371         }
372
373         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
374                 pos = skb_put(skb, 9);
375                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
376                 *pos++ = 7; /* len */
377                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
378                 *pos++ = 0x50;
379                 *pos++ = 0xf2;
380                 *pos++ = 2; /* WME */
381                 *pos++ = 0; /* WME info */
382                 *pos++ = 1; /* WME ver */
383                 *pos++ = 0;
384         }
385
386         /* wmm support is a must to HT */
387         /*
388          * IEEE802.11n does not allow TKIP/WEP as pairwise
389          * ciphers in HT mode. We still associate in non-ht
390          * mode (11a/b/g) if any one of these ciphers is
391          * configured as pairwise.
392          */
393         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
394             sband->ht_cap.ht_supported &&
395             (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
396             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
397             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
398                 struct ieee80211_ht_info *ht_info =
399                         (struct ieee80211_ht_info *)(ht_ie + 2);
400                 u16 cap = sband->ht_cap.cap;
401                 __le16 tmp;
402                 u32 flags = local->hw.conf.channel->flags;
403
404                 /* determine capability flags */
405
406                 if (ieee80211_disable_40mhz_24ghz &&
407                     sband->band == IEEE80211_BAND_2GHZ) {
408                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
409                         cap &= ~IEEE80211_HT_CAP_SGI_40;
410                 }
411
412                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
413                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
414                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
415                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
416                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
417                         }
418                         break;
419                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
420                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
421                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
422                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
423                         }
424                         break;
425                 }
426
427                 /* set SM PS mode properly */
428                 cap &= ~IEEE80211_HT_CAP_SM_PS;
429                 /* new association always uses requested smps mode */
430                 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
431                         if (ifmgd->powersave)
432                                 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
433                         else
434                                 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
435                 } else
436                         ifmgd->ap_smps = ifmgd->req_smps;
437
438                 switch (ifmgd->ap_smps) {
439                 case IEEE80211_SMPS_AUTOMATIC:
440                 case IEEE80211_SMPS_NUM_MODES:
441                         WARN_ON(1);
442                 case IEEE80211_SMPS_OFF:
443                         cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
444                                 IEEE80211_HT_CAP_SM_PS_SHIFT;
445                         break;
446                 case IEEE80211_SMPS_STATIC:
447                         cap |= WLAN_HT_CAP_SM_PS_STATIC <<
448                                 IEEE80211_HT_CAP_SM_PS_SHIFT;
449                         break;
450                 case IEEE80211_SMPS_DYNAMIC:
451                         cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
452                                 IEEE80211_HT_CAP_SM_PS_SHIFT;
453                         break;
454                 }
455
456                 /* reserve and fill IE */
457
458                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
459                 *pos++ = WLAN_EID_HT_CAPABILITY;
460                 *pos++ = sizeof(struct ieee80211_ht_cap);
461                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
462
463                 /* capability flags */
464                 tmp = cpu_to_le16(cap);
465                 memcpy(pos, &tmp, sizeof(u16));
466                 pos += sizeof(u16);
467
468                 /* AMPDU parameters */
469                 *pos++ = sband->ht_cap.ampdu_factor |
470                          (sband->ht_cap.ampdu_density <<
471                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
472
473                 /* MCS set */
474                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
475                 pos += sizeof(sband->ht_cap.mcs);
476
477                 /* extended capabilities */
478                 pos += sizeof(__le16);
479
480                 /* BF capabilities */
481                 pos += sizeof(__le32);
482
483                 /* antenna selection */
484                 pos += sizeof(u8);
485         }
486
487         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
488         ieee80211_tx_skb(sdata, skb);
489 }
490
491
492 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
493                                            const u8 *bssid, u16 stype, u16 reason,
494                                            void *cookie)
495 {
496         struct ieee80211_local *local = sdata->local;
497         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
498         struct sk_buff *skb;
499         struct ieee80211_mgmt *mgmt;
500
501         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
502         if (!skb) {
503                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
504                        "deauth/disassoc frame\n", sdata->name);
505                 return;
506         }
507         skb_reserve(skb, local->hw.extra_tx_headroom);
508
509         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
510         memset(mgmt, 0, 24);
511         memcpy(mgmt->da, bssid, ETH_ALEN);
512         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
513         memcpy(mgmt->bssid, bssid, ETH_ALEN);
514         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
515         skb_put(skb, 2);
516         /* u.deauth.reason_code == u.disassoc.reason_code */
517         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
518
519         if (stype == IEEE80211_STYPE_DEAUTH)
520                 if (cookie)
521                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
522                 else
523                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
524         else
525                 if (cookie)
526                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
527                 else
528                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
529         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
530                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
531         ieee80211_tx_skb(sdata, skb);
532 }
533
534 void ieee80211_send_pspoll(struct ieee80211_local *local,
535                            struct ieee80211_sub_if_data *sdata)
536 {
537         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
538         struct ieee80211_pspoll *pspoll;
539         struct sk_buff *skb;
540         u16 fc;
541
542         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
543         if (!skb) {
544                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
545                        "pspoll frame\n", sdata->name);
546                 return;
547         }
548         skb_reserve(skb, local->hw.extra_tx_headroom);
549
550         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
551         memset(pspoll, 0, sizeof(*pspoll));
552         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
553         pspoll->frame_control = cpu_to_le16(fc);
554         pspoll->aid = cpu_to_le16(ifmgd->aid);
555
556         /* aid in PS-Poll has its two MSBs each set to 1 */
557         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
558
559         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
560         memcpy(pspoll->ta, sdata->vif.addr, ETH_ALEN);
561
562         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
563         ieee80211_tx_skb(sdata, skb);
564 }
565
566 void ieee80211_send_nullfunc(struct ieee80211_local *local,
567                              struct ieee80211_sub_if_data *sdata,
568                              int powersave)
569 {
570         struct sk_buff *skb;
571         struct ieee80211_hdr *nullfunc;
572         __le16 fc;
573
574         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
575                 return;
576
577         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
578         if (!skb) {
579                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
580                        "frame\n", sdata->name);
581                 return;
582         }
583         skb_reserve(skb, local->hw.extra_tx_headroom);
584
585         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
586         memset(nullfunc, 0, 24);
587         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
588                          IEEE80211_FCTL_TODS);
589         if (powersave)
590                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
591         nullfunc->frame_control = fc;
592         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
593         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
594         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
595
596         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
597         ieee80211_tx_skb(sdata, skb);
598 }
599
600 /* spectrum management related things */
601 static void ieee80211_chswitch_work(struct work_struct *work)
602 {
603         struct ieee80211_sub_if_data *sdata =
604                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
605         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
606
607         if (!netif_running(sdata->dev))
608                 return;
609
610         mutex_lock(&ifmgd->mtx);
611         if (!ifmgd->associated)
612                 goto out;
613
614         sdata->local->oper_channel = sdata->local->csa_channel;
615         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
616
617         /* XXX: shouldn't really modify cfg80211-owned data! */
618         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
619
620         ieee80211_wake_queues_by_reason(&sdata->local->hw,
621                                         IEEE80211_QUEUE_STOP_REASON_CSA);
622  out:
623         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
624         mutex_unlock(&ifmgd->mtx);
625 }
626
627 static void ieee80211_chswitch_timer(unsigned long data)
628 {
629         struct ieee80211_sub_if_data *sdata =
630                 (struct ieee80211_sub_if_data *) data;
631         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
632
633         if (sdata->local->quiescing) {
634                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
635                 return;
636         }
637
638         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
639 }
640
641 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
642                                       struct ieee80211_channel_sw_ie *sw_elem,
643                                       struct ieee80211_bss *bss)
644 {
645         struct ieee80211_channel *new_ch;
646         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
647         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
648
649         ASSERT_MGD_MTX(ifmgd);
650
651         if (!ifmgd->associated)
652                 return;
653
654         if (sdata->local->scanning)
655                 return;
656
657         /* Disregard subsequent beacons if we are already running a timer
658            processing a CSA */
659
660         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
661                 return;
662
663         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
664         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
665                 return;
666
667         sdata->local->csa_channel = new_ch;
668
669         if (sw_elem->count <= 1) {
670                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
671         } else {
672                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
673                                         IEEE80211_QUEUE_STOP_REASON_CSA);
674                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
675                 mod_timer(&ifmgd->chswitch_timer,
676                           jiffies +
677                           msecs_to_jiffies(sw_elem->count *
678                                            bss->cbss.beacon_interval));
679         }
680 }
681
682 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
683                                         u16 capab_info, u8 *pwr_constr_elem,
684                                         u8 pwr_constr_elem_len)
685 {
686         struct ieee80211_conf *conf = &sdata->local->hw.conf;
687
688         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
689                 return;
690
691         /* Power constraint IE length should be 1 octet */
692         if (pwr_constr_elem_len != 1)
693                 return;
694
695         if ((*pwr_constr_elem <= conf->channel->max_power) &&
696             (*pwr_constr_elem != sdata->local->power_constr_level)) {
697                 sdata->local->power_constr_level = *pwr_constr_elem;
698                 ieee80211_hw_config(sdata->local, 0);
699         }
700 }
701
702 /* powersave */
703 static void ieee80211_enable_ps(struct ieee80211_local *local,
704                                 struct ieee80211_sub_if_data *sdata)
705 {
706         struct ieee80211_conf *conf = &local->hw.conf;
707
708         /*
709          * If we are scanning right now then the parameters will
710          * take effect when scan finishes.
711          */
712         if (local->scanning)
713                 return;
714
715         if (conf->dynamic_ps_timeout > 0 &&
716             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
717                 mod_timer(&local->dynamic_ps_timer, jiffies +
718                           msecs_to_jiffies(conf->dynamic_ps_timeout));
719         } else {
720                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
721                         ieee80211_send_nullfunc(local, sdata, 1);
722                 conf->flags |= IEEE80211_CONF_PS;
723                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
724         }
725 }
726
727 static void ieee80211_change_ps(struct ieee80211_local *local)
728 {
729         struct ieee80211_conf *conf = &local->hw.conf;
730
731         if (local->ps_sdata) {
732                 ieee80211_enable_ps(local, local->ps_sdata);
733         } else if (conf->flags & IEEE80211_CONF_PS) {
734                 conf->flags &= ~IEEE80211_CONF_PS;
735                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
736                 del_timer_sync(&local->dynamic_ps_timer);
737                 cancel_work_sync(&local->dynamic_ps_enable_work);
738         }
739 }
740
741 /* need to hold RTNL or interface lock */
742 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
743 {
744         struct ieee80211_sub_if_data *sdata, *found = NULL;
745         int count = 0;
746
747         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
748                 local->ps_sdata = NULL;
749                 return;
750         }
751
752         list_for_each_entry(sdata, &local->interfaces, list) {
753                 if (!netif_running(sdata->dev))
754                         continue;
755                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
756                         continue;
757                 found = sdata;
758                 count++;
759         }
760
761         if (count == 1 && found->u.mgd.powersave &&
762             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
763             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
764                                     IEEE80211_STA_CONNECTION_POLL))) {
765                 s32 beaconint_us;
766
767                 if (latency < 0)
768                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
769
770                 beaconint_us = ieee80211_tu_to_usec(
771                                         found->vif.bss_conf.beacon_int);
772
773                 if (beaconint_us > latency) {
774                         local->ps_sdata = NULL;
775                 } else {
776                         u8 dtimper = found->vif.bss_conf.dtim_period;
777                         int maxslp = 1;
778
779                         if (dtimper > 1)
780                                 maxslp = min_t(int, dtimper,
781                                                     latency / beaconint_us);
782
783                         local->hw.conf.max_sleep_period = maxslp;
784                         local->ps_sdata = found;
785                 }
786         } else {
787                 local->ps_sdata = NULL;
788         }
789
790         ieee80211_change_ps(local);
791 }
792
793 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
794 {
795         struct ieee80211_local *local =
796                 container_of(work, struct ieee80211_local,
797                              dynamic_ps_disable_work);
798
799         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
800                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
801                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
802         }
803
804         ieee80211_wake_queues_by_reason(&local->hw,
805                                         IEEE80211_QUEUE_STOP_REASON_PS);
806 }
807
808 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
809 {
810         struct ieee80211_local *local =
811                 container_of(work, struct ieee80211_local,
812                              dynamic_ps_enable_work);
813         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
814
815         /* can only happen when PS was just disabled anyway */
816         if (!sdata)
817                 return;
818
819         if (local->hw.conf.flags & IEEE80211_CONF_PS)
820                 return;
821
822         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
823                 ieee80211_send_nullfunc(local, sdata, 1);
824
825         local->hw.conf.flags |= IEEE80211_CONF_PS;
826         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
827 }
828
829 void ieee80211_dynamic_ps_timer(unsigned long data)
830 {
831         struct ieee80211_local *local = (void *) data;
832
833         if (local->quiescing || local->suspended)
834                 return;
835
836         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
837 }
838
839 /* MLME */
840 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
841                                      struct ieee80211_if_managed *ifmgd,
842                                      u8 *wmm_param, size_t wmm_param_len)
843 {
844         struct ieee80211_tx_queue_params params;
845         size_t left;
846         int count;
847         u8 *pos;
848
849         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
850                 return;
851
852         if (!wmm_param)
853                 return;
854
855         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
856                 return;
857         count = wmm_param[6] & 0x0f;
858         if (count == ifmgd->wmm_last_param_set)
859                 return;
860         ifmgd->wmm_last_param_set = count;
861
862         pos = wmm_param + 8;
863         left = wmm_param_len - 8;
864
865         memset(&params, 0, sizeof(params));
866
867         local->wmm_acm = 0;
868         for (; left >= 4; left -= 4, pos += 4) {
869                 int aci = (pos[0] >> 5) & 0x03;
870                 int acm = (pos[0] >> 4) & 0x01;
871                 int queue;
872
873                 switch (aci) {
874                 case 1: /* AC_BK */
875                         queue = 3;
876                         if (acm)
877                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
878                         break;
879                 case 2: /* AC_VI */
880                         queue = 1;
881                         if (acm)
882                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
883                         break;
884                 case 3: /* AC_VO */
885                         queue = 0;
886                         if (acm)
887                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
888                         break;
889                 case 0: /* AC_BE */
890                 default:
891                         queue = 2;
892                         if (acm)
893                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
894                         break;
895                 }
896
897                 params.aifs = pos[0] & 0x0f;
898                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
899                 params.cw_min = ecw2cw(pos[1] & 0x0f);
900                 params.txop = get_unaligned_le16(pos + 2);
901 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
902                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
903                        "cWmin=%d cWmax=%d txop=%d\n",
904                        wiphy_name(local->hw.wiphy), queue, aci, acm,
905                        params.aifs, params.cw_min, params.cw_max, params.txop);
906 #endif
907                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
908                         printk(KERN_DEBUG "%s: failed to set TX queue "
909                                "parameters for queue %d\n",
910                                wiphy_name(local->hw.wiphy), queue);
911         }
912 }
913
914 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
915                                            u16 capab, bool erp_valid, u8 erp)
916 {
917         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
918         u32 changed = 0;
919         bool use_protection;
920         bool use_short_preamble;
921         bool use_short_slot;
922
923         if (erp_valid) {
924                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
925                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
926         } else {
927                 use_protection = false;
928                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
929         }
930
931         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
932
933         if (use_protection != bss_conf->use_cts_prot) {
934                 bss_conf->use_cts_prot = use_protection;
935                 changed |= BSS_CHANGED_ERP_CTS_PROT;
936         }
937
938         if (use_short_preamble != bss_conf->use_short_preamble) {
939                 bss_conf->use_short_preamble = use_short_preamble;
940                 changed |= BSS_CHANGED_ERP_PREAMBLE;
941         }
942
943         if (use_short_slot != bss_conf->use_short_slot) {
944                 bss_conf->use_short_slot = use_short_slot;
945                 changed |= BSS_CHANGED_ERP_SLOT;
946         }
947
948         return changed;
949 }
950
951 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
952                                      struct ieee80211_mgd_work *wk,
953                                      u32 bss_info_changed)
954 {
955         struct ieee80211_local *local = sdata->local;
956         struct ieee80211_bss *bss = wk->bss;
957
958         bss_info_changed |= BSS_CHANGED_ASSOC;
959         /* set timing information */
960         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
961         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
962         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
963
964         bss_info_changed |= BSS_CHANGED_BEACON_INT;
965         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
966                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
967
968         sdata->u.mgd.associated = bss;
969         sdata->u.mgd.old_associate_work = wk;
970         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
971
972         /* just to be sure */
973         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
974                                 IEEE80211_STA_BEACON_POLL);
975
976         /*
977          * Always handle WMM once after association regardless
978          * of the first value the AP uses. Setting -1 here has
979          * that effect because the AP values is an unsigned
980          * 4-bit value.
981          */
982         sdata->u.mgd.wmm_last_param_set = -1;
983
984         ieee80211_led_assoc(local, 1);
985
986         sdata->vif.bss_conf.assoc = 1;
987         /*
988          * For now just always ask the driver to update the basic rateset
989          * when we have associated, we aren't checking whether it actually
990          * changed or not.
991          */
992         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
993
994         /* And the BSSID changed - we're associated now */
995         bss_info_changed |= BSS_CHANGED_BSSID;
996
997         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
998
999         mutex_lock(&local->iflist_mtx);
1000         ieee80211_recalc_ps(local, -1);
1001         ieee80211_recalc_smps(local, sdata);
1002         mutex_unlock(&local->iflist_mtx);
1003
1004         netif_start_queue(sdata->dev);
1005         netif_carrier_on(sdata->dev);
1006 }
1007
1008 static enum rx_mgmt_action __must_check
1009 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
1010                        struct ieee80211_mgd_work *wk)
1011 {
1012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1013         struct ieee80211_local *local = sdata->local;
1014
1015         wk->tries++;
1016         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1017                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
1018                        sdata->name, wk->bss->cbss.bssid);
1019
1020                 /*
1021                  * Most likely AP is not in the range so remove the
1022                  * bss struct for that AP.
1023                  */
1024                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1025
1026                 /*
1027                  * We might have a pending scan which had no chance to run yet
1028                  * due to work needing to be done. Hence, queue the STAs work
1029                  * again for that.
1030                  */
1031                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1032                 return RX_MGMT_CFG80211_AUTH_TO;
1033         }
1034
1035         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
1036                         sdata->name, wk->bss->cbss.bssid,
1037                         wk->tries);
1038
1039         /*
1040          * Direct probe is sent to broadcast address as some APs
1041          * will not answer to direct packet in unassociated state.
1042          */
1043         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
1044
1045         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1046         run_again(ifmgd, wk->timeout);
1047
1048         return RX_MGMT_NONE;
1049 }
1050
1051
1052 static enum rx_mgmt_action __must_check
1053 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
1054                        struct ieee80211_mgd_work *wk)
1055 {
1056         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1057         struct ieee80211_local *local = sdata->local;
1058
1059         wk->tries++;
1060         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1061                 printk(KERN_DEBUG "%s: authentication with AP %pM"
1062                        " timed out\n",
1063                        sdata->name, wk->bss->cbss.bssid);
1064
1065                 /*
1066                  * Most likely AP is not in the range so remove the
1067                  * bss struct for that AP.
1068                  */
1069                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1070
1071                 /*
1072                  * We might have a pending scan which had no chance to run yet
1073                  * due to work needing to be done. Hence, queue the STAs work
1074                  * again for that.
1075                  */
1076                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1077                 return RX_MGMT_CFG80211_AUTH_TO;
1078         }
1079
1080         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1081                sdata->name, wk->bss->cbss.bssid, wk->tries);
1082
1083         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1084                             wk->bss->cbss.bssid, NULL, 0, 0);
1085         wk->auth_transaction = 2;
1086
1087         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1088         run_again(ifmgd, wk->timeout);
1089
1090         return RX_MGMT_NONE;
1091 }
1092
1093 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1094                                    bool deauth)
1095 {
1096         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1097         struct ieee80211_local *local = sdata->local;
1098         struct sta_info *sta;
1099         u32 changed = 0, config_changed = 0;
1100         u8 bssid[ETH_ALEN];
1101
1102         ASSERT_MGD_MTX(ifmgd);
1103
1104         if (WARN_ON(!ifmgd->associated))
1105                 return;
1106
1107         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1108
1109         ifmgd->associated = NULL;
1110         memset(ifmgd->bssid, 0, ETH_ALEN);
1111
1112         if (deauth) {
1113                 kfree(ifmgd->old_associate_work);
1114                 ifmgd->old_associate_work = NULL;
1115         } else {
1116                 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1117
1118                 wk->state = IEEE80211_MGD_STATE_IDLE;
1119                 list_add(&wk->list, &ifmgd->work_list);
1120         }
1121
1122         /*
1123          * we need to commit the associated = NULL change because the
1124          * scan code uses that to determine whether this iface should
1125          * go to/wake up from powersave or not -- and could otherwise
1126          * wake the queues erroneously.
1127          */
1128         smp_mb();
1129
1130         /*
1131          * Thus, we can only afterwards stop the queues -- to account
1132          * for the case where another CPU is finishing a scan at this
1133          * time -- we don't want the scan code to enable queues.
1134          */
1135
1136         netif_stop_queue(sdata->dev);
1137         netif_carrier_off(sdata->dev);
1138
1139         rcu_read_lock();
1140         sta = sta_info_get(sdata, bssid);
1141         if (sta)
1142                 ieee80211_sta_tear_down_BA_sessions(sta);
1143         rcu_read_unlock();
1144
1145         changed |= ieee80211_reset_erp_info(sdata);
1146
1147         ieee80211_led_assoc(local, 0);
1148         changed |= BSS_CHANGED_ASSOC;
1149         sdata->vif.bss_conf.assoc = false;
1150
1151         ieee80211_set_wmm_default(sdata);
1152
1153         /* channel(_type) changes are handled by ieee80211_hw_config */
1154         local->oper_channel_type = NL80211_CHAN_NO_HT;
1155
1156         /* on the next assoc, re-program HT parameters */
1157         sdata->ht_opmode_valid = false;
1158
1159         local->power_constr_level = 0;
1160
1161         del_timer_sync(&local->dynamic_ps_timer);
1162         cancel_work_sync(&local->dynamic_ps_enable_work);
1163
1164         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1165                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1166                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1167         }
1168
1169         ieee80211_hw_config(local, config_changed);
1170
1171         /* And the BSSID changed -- not very interesting here */
1172         changed |= BSS_CHANGED_BSSID;
1173         ieee80211_bss_info_change_notify(sdata, changed);
1174
1175         rcu_read_lock();
1176
1177         sta = sta_info_get(sdata, bssid);
1178         if (!sta) {
1179                 rcu_read_unlock();
1180                 return;
1181         }
1182
1183         sta_info_unlink(&sta);
1184
1185         rcu_read_unlock();
1186
1187         sta_info_destroy(sta);
1188 }
1189
1190 static enum rx_mgmt_action __must_check
1191 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1192                     struct ieee80211_mgd_work *wk)
1193 {
1194         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1195         struct ieee80211_local *local = sdata->local;
1196
1197         wk->tries++;
1198         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1199                 printk(KERN_DEBUG "%s: association with AP %pM"
1200                        " timed out\n",
1201                        sdata->name, wk->bss->cbss.bssid);
1202
1203                 /*
1204                  * Most likely AP is not in the range so remove the
1205                  * bss struct for that AP.
1206                  */
1207                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1208
1209                 /*
1210                  * We might have a pending scan which had no chance to run yet
1211                  * due to work needing to be done. Hence, queue the STAs work
1212                  * again for that.
1213                  */
1214                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1215                 return RX_MGMT_CFG80211_ASSOC_TO;
1216         }
1217
1218         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1219                sdata->name, wk->bss->cbss.bssid, wk->tries);
1220         ieee80211_send_assoc(sdata, wk);
1221
1222         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1223         run_again(ifmgd, wk->timeout);
1224
1225         return RX_MGMT_NONE;
1226 }
1227
1228 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1229                              struct ieee80211_hdr *hdr)
1230 {
1231         /*
1232          * We can postpone the mgd.timer whenever receiving unicast frames
1233          * from AP because we know that the connection is working both ways
1234          * at that time. But multicast frames (and hence also beacons) must
1235          * be ignored here, because we need to trigger the timer during
1236          * data idle periods for sending the periodic probe request to the
1237          * AP we're connected to.
1238          */
1239         if (is_multicast_ether_addr(hdr->addr1))
1240                 return;
1241
1242         mod_timer(&sdata->u.mgd.conn_mon_timer,
1243                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1244 }
1245
1246 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1247 {
1248         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1249         const u8 *ssid;
1250
1251         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1252         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1253                                  ssid + 2, ssid[1], NULL, 0);
1254
1255         ifmgd->probe_send_count++;
1256         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1257         run_again(ifmgd, ifmgd->probe_timeout);
1258 }
1259
1260 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1261                                    bool beacon)
1262 {
1263         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1264         bool already = false;
1265
1266         if (!netif_running(sdata->dev))
1267                 return;
1268
1269         if (sdata->local->scanning)
1270                 return;
1271
1272         mutex_lock(&ifmgd->mtx);
1273
1274         if (!ifmgd->associated)
1275                 goto out;
1276
1277 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1278         if (beacon && net_ratelimit())
1279                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1280                        "- sending probe request\n", sdata->name);
1281 #endif
1282
1283         /*
1284          * The driver/our work has already reported this event or the
1285          * connection monitoring has kicked in and we have already sent
1286          * a probe request. Or maybe the AP died and the driver keeps
1287          * reporting until we disassociate...
1288          *
1289          * In either case we have to ignore the current call to this
1290          * function (except for setting the correct probe reason bit)
1291          * because otherwise we would reset the timer every time and
1292          * never check whether we received a probe response!
1293          */
1294         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1295                             IEEE80211_STA_CONNECTION_POLL))
1296                 already = true;
1297
1298         if (beacon)
1299                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1300         else
1301                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1302
1303         if (already)
1304                 goto out;
1305
1306         mutex_lock(&sdata->local->iflist_mtx);
1307         ieee80211_recalc_ps(sdata->local, -1);
1308         mutex_unlock(&sdata->local->iflist_mtx);
1309
1310         ifmgd->probe_send_count = 0;
1311         ieee80211_mgd_probe_ap_send(sdata);
1312  out:
1313         mutex_unlock(&ifmgd->mtx);
1314 }
1315
1316 void ieee80211_beacon_loss_work(struct work_struct *work)
1317 {
1318         struct ieee80211_sub_if_data *sdata =
1319                 container_of(work, struct ieee80211_sub_if_data,
1320                              u.mgd.beacon_loss_work);
1321
1322         ieee80211_mgd_probe_ap(sdata, true);
1323 }
1324
1325 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1326 {
1327         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1328
1329         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1330 }
1331 EXPORT_SYMBOL(ieee80211_beacon_loss);
1332
1333 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1334                                      struct ieee80211_mgd_work *wk)
1335 {
1336         wk->state = IEEE80211_MGD_STATE_IDLE;
1337         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1338 }
1339
1340
1341 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1342                                      struct ieee80211_mgd_work *wk,
1343                                      struct ieee80211_mgmt *mgmt,
1344                                      size_t len)
1345 {
1346         u8 *pos;
1347         struct ieee802_11_elems elems;
1348
1349         pos = mgmt->u.auth.variable;
1350         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1351         if (!elems.challenge)
1352                 return;
1353         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1354                             elems.challenge - 2, elems.challenge_len + 2,
1355                             wk->bss->cbss.bssid,
1356                             wk->key, wk->key_len, wk->key_idx);
1357         wk->auth_transaction = 4;
1358 }
1359
1360 static enum rx_mgmt_action __must_check
1361 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1362                        struct ieee80211_mgd_work *wk,
1363                        struct ieee80211_mgmt *mgmt, size_t len)
1364 {
1365         u16 auth_alg, auth_transaction, status_code;
1366
1367         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1368                 return RX_MGMT_NONE;
1369
1370         if (len < 24 + 6)
1371                 return RX_MGMT_NONE;
1372
1373         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1374                 return RX_MGMT_NONE;
1375
1376         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1377                 return RX_MGMT_NONE;
1378
1379         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1380         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1381         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1382
1383         if (auth_alg != wk->auth_alg ||
1384             auth_transaction != wk->auth_transaction)
1385                 return RX_MGMT_NONE;
1386
1387         if (status_code != WLAN_STATUS_SUCCESS) {
1388                 list_del(&wk->list);
1389                 kfree(wk);
1390                 return RX_MGMT_CFG80211_AUTH;
1391         }
1392
1393         switch (wk->auth_alg) {
1394         case WLAN_AUTH_OPEN:
1395         case WLAN_AUTH_LEAP:
1396         case WLAN_AUTH_FT:
1397                 ieee80211_auth_completed(sdata, wk);
1398                 return RX_MGMT_CFG80211_AUTH;
1399         case WLAN_AUTH_SHARED_KEY:
1400                 if (wk->auth_transaction == 4) {
1401                         ieee80211_auth_completed(sdata, wk);
1402                         return RX_MGMT_CFG80211_AUTH;
1403                 } else
1404                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1405                 break;
1406         }
1407
1408         return RX_MGMT_NONE;
1409 }
1410
1411
1412 static enum rx_mgmt_action __must_check
1413 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1414                          struct ieee80211_mgd_work *wk,
1415                          struct ieee80211_mgmt *mgmt, size_t len)
1416 {
1417         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1418         const u8 *bssid = NULL;
1419         u16 reason_code;
1420
1421         if (len < 24 + 2)
1422                 return RX_MGMT_NONE;
1423
1424         ASSERT_MGD_MTX(ifmgd);
1425
1426         if (wk)
1427                 bssid = wk->bss->cbss.bssid;
1428         else
1429                 bssid = ifmgd->associated->cbss.bssid;
1430
1431         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1432
1433         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1434                         sdata->name, bssid, reason_code);
1435
1436         if (!wk) {
1437                 ieee80211_set_disassoc(sdata, true);
1438                 ieee80211_recalc_idle(sdata->local);
1439         } else {
1440                 list_del(&wk->list);
1441                 kfree(wk);
1442         }
1443
1444         return RX_MGMT_CFG80211_DEAUTH;
1445 }
1446
1447
1448 static enum rx_mgmt_action __must_check
1449 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1450                            struct ieee80211_mgmt *mgmt, size_t len)
1451 {
1452         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1453         u16 reason_code;
1454
1455         if (len < 24 + 2)
1456                 return RX_MGMT_NONE;
1457
1458         ASSERT_MGD_MTX(ifmgd);
1459
1460         if (WARN_ON(!ifmgd->associated))
1461                 return RX_MGMT_NONE;
1462
1463         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1464                 return RX_MGMT_NONE;
1465
1466         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1467
1468         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1469                         sdata->name, mgmt->sa, reason_code);
1470
1471         ieee80211_set_disassoc(sdata, false);
1472         ieee80211_recalc_idle(sdata->local);
1473         return RX_MGMT_CFG80211_DISASSOC;
1474 }
1475
1476
1477 static enum rx_mgmt_action __must_check
1478 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1479                              struct ieee80211_mgd_work *wk,
1480                              struct ieee80211_mgmt *mgmt, size_t len,
1481                              bool reassoc)
1482 {
1483         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1484         struct ieee80211_local *local = sdata->local;
1485         struct ieee80211_supported_band *sband;
1486         struct sta_info *sta;
1487         u32 rates, basic_rates;
1488         u16 capab_info, status_code, aid;
1489         struct ieee802_11_elems elems;
1490         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1491         u8 *pos;
1492         u32 changed = 0;
1493         int i, j, err;
1494         bool have_higher_than_11mbit = false;
1495         u16 ap_ht_cap_flags;
1496
1497         /*
1498          * AssocResp and ReassocResp have identical structure, so process both
1499          * of them in this function.
1500          */
1501
1502         if (len < 24 + 6)
1503                 return RX_MGMT_NONE;
1504
1505         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1506                 return RX_MGMT_NONE;
1507
1508         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1509         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1510         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1511
1512         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1513                "status=%d aid=%d)\n",
1514                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
1515                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1516
1517         pos = mgmt->u.assoc_resp.variable;
1518         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1519
1520         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1521             elems.timeout_int && elems.timeout_int_len == 5 &&
1522             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1523                 u32 tu, ms;
1524                 tu = get_unaligned_le32(elems.timeout_int + 1);
1525                 ms = tu * 1024 / 1000;
1526                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1527                        "comeback duration %u TU (%u ms)\n",
1528                        sdata->name, tu, ms);
1529                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1530                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1531                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1532                 return RX_MGMT_NONE;
1533         }
1534
1535         if (status_code != WLAN_STATUS_SUCCESS) {
1536                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1537                        sdata->name, status_code);
1538                 wk->state = IEEE80211_MGD_STATE_IDLE;
1539                 return RX_MGMT_CFG80211_ASSOC;
1540         }
1541
1542         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1543                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1544                        "set\n", sdata->name, aid);
1545         aid &= ~(BIT(15) | BIT(14));
1546
1547         if (!elems.supp_rates) {
1548                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1549                        sdata->name);
1550                 return RX_MGMT_NONE;
1551         }
1552
1553         printk(KERN_DEBUG "%s: associated\n", sdata->name);
1554         ifmgd->aid = aid;
1555
1556         sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1557         if (!sta) {
1558                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1559                        " the AP\n", sdata->name);
1560                 return RX_MGMT_CFG80211_ASSOC_ERROR;
1561         }
1562
1563         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1564                            WLAN_STA_ASSOC_AP);
1565         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1566                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1567
1568         rates = 0;
1569         basic_rates = 0;
1570         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1571
1572         for (i = 0; i < elems.supp_rates_len; i++) {
1573                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1574                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1575
1576                 if (rate > 110)
1577                         have_higher_than_11mbit = true;
1578
1579                 for (j = 0; j < sband->n_bitrates; j++) {
1580                         if (sband->bitrates[j].bitrate == rate) {
1581                                 rates |= BIT(j);
1582                                 if (is_basic)
1583                                         basic_rates |= BIT(j);
1584                                 break;
1585                         }
1586                 }
1587         }
1588
1589         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1590                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1591                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1592
1593                 if (rate > 110)
1594                         have_higher_than_11mbit = true;
1595
1596                 for (j = 0; j < sband->n_bitrates; j++) {
1597                         if (sband->bitrates[j].bitrate == rate) {
1598                                 rates |= BIT(j);
1599                                 if (is_basic)
1600                                         basic_rates |= BIT(j);
1601                                 break;
1602                         }
1603                 }
1604         }
1605
1606         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1607         sdata->vif.bss_conf.basic_rates = basic_rates;
1608
1609         /* cf. IEEE 802.11 9.2.12 */
1610         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1611             have_higher_than_11mbit)
1612                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1613         else
1614                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1615
1616         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1617                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1618                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1619
1620         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1621
1622         rate_control_rate_init(sta);
1623
1624         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1625                 set_sta_flags(sta, WLAN_STA_MFP);
1626
1627         if (elems.wmm_param)
1628                 set_sta_flags(sta, WLAN_STA_WME);
1629
1630         err = sta_info_insert(sta);
1631         sta = NULL;
1632         if (err) {
1633                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1634                        " the AP (error %d)\n", sdata->name, err);
1635                 return RX_MGMT_CFG80211_ASSOC_ERROR;
1636         }
1637
1638         if (elems.wmm_param)
1639                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1640                                          elems.wmm_param_len);
1641         else
1642                 ieee80211_set_wmm_default(sdata);
1643
1644         if (elems.ht_info_elem && elems.wmm_param &&
1645             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1646             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1647                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1648                                                wk->bss->cbss.bssid,
1649                                                ap_ht_cap_flags);
1650
1651         /* delete work item -- must be before set_associated for PS */
1652         list_del(&wk->list);
1653
1654         /* set AID and assoc capability,
1655          * ieee80211_set_associated() will tell the driver */
1656         bss_conf->aid = aid;
1657         bss_conf->assoc_capability = capab_info;
1658         /* this will take ownership of wk */
1659         ieee80211_set_associated(sdata, wk, changed);
1660
1661         /*
1662          * Start timer to probe the connection to the AP now.
1663          * Also start the timer that will detect beacon loss.
1664          */
1665         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1666         mod_beacon_timer(sdata);
1667
1668         return RX_MGMT_CFG80211_ASSOC;
1669 }
1670
1671
1672 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1673                                   struct ieee80211_mgmt *mgmt,
1674                                   size_t len,
1675                                   struct ieee80211_rx_status *rx_status,
1676                                   struct ieee802_11_elems *elems,
1677                                   bool beacon)
1678 {
1679         struct ieee80211_local *local = sdata->local;
1680         int freq;
1681         struct ieee80211_bss *bss;
1682         struct ieee80211_channel *channel;
1683
1684         if (elems->ds_params && elems->ds_params_len == 1)
1685                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1686         else
1687                 freq = rx_status->freq;
1688
1689         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1690
1691         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1692                 return;
1693
1694         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1695                                         channel, beacon);
1696         if (bss)
1697                 ieee80211_rx_bss_put(local, bss);
1698
1699         if (!sdata->u.mgd.associated)
1700                 return;
1701
1702         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1703             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1704                                                         ETH_ALEN) == 0)) {
1705                 struct ieee80211_channel_sw_ie *sw_elem =
1706                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1707                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1708         }
1709 }
1710
1711
1712 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1713                                          struct ieee80211_mgd_work *wk,
1714                                          struct ieee80211_mgmt *mgmt, size_t len,
1715                                          struct ieee80211_rx_status *rx_status)
1716 {
1717         struct ieee80211_if_managed *ifmgd;
1718         size_t baselen;
1719         struct ieee802_11_elems elems;
1720
1721         ifmgd = &sdata->u.mgd;
1722
1723         ASSERT_MGD_MTX(ifmgd);
1724
1725         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1726                 return; /* ignore ProbeResp to foreign address */
1727
1728         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1729         if (baselen > len)
1730                 return;
1731
1732         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1733                                 &elems);
1734
1735         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1736
1737         /* direct probe may be part of the association flow */
1738         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1739                 printk(KERN_DEBUG "%s: direct probe responded\n",
1740                        sdata->name);
1741                 wk->tries = 0;
1742                 wk->state = IEEE80211_MGD_STATE_AUTH;
1743                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1744         }
1745
1746         if (ifmgd->associated &&
1747             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1748             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1749                             IEEE80211_STA_CONNECTION_POLL)) {
1750                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1751                                   IEEE80211_STA_BEACON_POLL);
1752                 mutex_lock(&sdata->local->iflist_mtx);
1753                 ieee80211_recalc_ps(sdata->local, -1);
1754                 mutex_unlock(&sdata->local->iflist_mtx);
1755                 /*
1756                  * We've received a probe response, but are not sure whether
1757                  * we have or will be receiving any beacons or data, so let's
1758                  * schedule the timers again, just in case.
1759                  */
1760                 mod_beacon_timer(sdata);
1761                 mod_timer(&ifmgd->conn_mon_timer,
1762                           round_jiffies_up(jiffies +
1763                                            IEEE80211_CONNECTION_IDLE_TIME));
1764         }
1765 }
1766
1767 /*
1768  * This is the canonical list of information elements we care about,
1769  * the filter code also gives us all changes to the Microsoft OUI
1770  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1771  *
1772  * We implement beacon filtering in software since that means we can
1773  * avoid processing the frame here and in cfg80211, and userspace
1774  * will not be able to tell whether the hardware supports it or not.
1775  *
1776  * XXX: This list needs to be dynamic -- userspace needs to be able to
1777  *      add items it requires. It also needs to be able to tell us to
1778  *      look out for other vendor IEs.
1779  */
1780 static const u64 care_about_ies =
1781         (1ULL << WLAN_EID_COUNTRY) |
1782         (1ULL << WLAN_EID_ERP_INFO) |
1783         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1784         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1785         (1ULL << WLAN_EID_HT_CAPABILITY) |
1786         (1ULL << WLAN_EID_HT_INFORMATION);
1787
1788 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1789                                      struct ieee80211_mgmt *mgmt,
1790                                      size_t len,
1791                                      struct ieee80211_rx_status *rx_status)
1792 {
1793         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1794         size_t baselen;
1795         struct ieee802_11_elems elems;
1796         struct ieee80211_local *local = sdata->local;
1797         u32 changed = 0;
1798         bool erp_valid, directed_tim = false;
1799         u8 erp_value = 0;
1800         u32 ncrc;
1801         u8 *bssid;
1802
1803         ASSERT_MGD_MTX(ifmgd);
1804
1805         /* Process beacon from the current BSS */
1806         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1807         if (baselen > len)
1808                 return;
1809
1810         if (rx_status->freq != local->hw.conf.channel->center_freq)
1811                 return;
1812
1813         /*
1814          * We might have received a number of frames, among them a
1815          * disassoc frame and a beacon...
1816          */
1817         if (!ifmgd->associated)
1818                 return;
1819
1820         bssid = ifmgd->associated->cbss.bssid;
1821
1822         /*
1823          * And in theory even frames from a different AP we were just
1824          * associated to a split-second ago!
1825          */
1826         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1827                 return;
1828
1829         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1830 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1831                 if (net_ratelimit()) {
1832                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1833                                "to a received beacon\n", sdata->name);
1834                 }
1835 #endif
1836                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1837                 mutex_lock(&local->iflist_mtx);
1838                 ieee80211_recalc_ps(local, -1);
1839                 mutex_unlock(&local->iflist_mtx);
1840         }
1841
1842         /*
1843          * Push the beacon loss detection into the future since
1844          * we are processing a beacon from the AP just now.
1845          */
1846         mod_beacon_timer(sdata);
1847
1848         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1849         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1850                                           len - baselen, &elems,
1851                                           care_about_ies, ncrc);
1852
1853         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1854                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1855                                                    ifmgd->aid);
1856
1857         if (ncrc != ifmgd->beacon_crc) {
1858                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1859                                       true);
1860
1861                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1862                                          elems.wmm_param_len);
1863         }
1864
1865         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1866                 if (directed_tim) {
1867                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1868                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1869                                 ieee80211_hw_config(local,
1870                                                     IEEE80211_CONF_CHANGE_PS);
1871                                 ieee80211_send_nullfunc(local, sdata, 0);
1872                         } else {
1873                                 local->pspolling = true;
1874
1875                                 /*
1876                                  * Here is assumed that the driver will be
1877                                  * able to send ps-poll frame and receive a
1878                                  * response even though power save mode is
1879                                  * enabled, but some drivers might require
1880                                  * to disable power save here. This needs
1881                                  * to be investigated.
1882                                  */
1883                                 ieee80211_send_pspoll(local, sdata);
1884                         }
1885                 }
1886         }
1887
1888         if (ncrc == ifmgd->beacon_crc)
1889                 return;
1890         ifmgd->beacon_crc = ncrc;
1891
1892         if (elems.erp_info && elems.erp_info_len >= 1) {
1893                 erp_valid = true;
1894                 erp_value = elems.erp_info[0];
1895         } else {
1896                 erp_valid = false;
1897         }
1898         changed |= ieee80211_handle_bss_capability(sdata,
1899                         le16_to_cpu(mgmt->u.beacon.capab_info),
1900                         erp_valid, erp_value);
1901
1902
1903         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1904             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1905                 struct sta_info *sta;
1906                 struct ieee80211_supported_band *sband;
1907                 u16 ap_ht_cap_flags;
1908
1909                 rcu_read_lock();
1910
1911                 sta = sta_info_get(sdata, bssid);
1912                 if (WARN_ON(!sta)) {
1913                         rcu_read_unlock();
1914                         return;
1915                 }
1916
1917                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1918
1919                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1920                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1921
1922                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1923
1924                 rcu_read_unlock();
1925
1926                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1927                                                bssid, ap_ht_cap_flags);
1928         }
1929
1930         /* Note: country IE parsing is done for us by cfg80211 */
1931         if (elems.country_elem) {
1932                 /* TODO: IBSS also needs this */
1933                 if (elems.pwr_constr_elem)
1934                         ieee80211_handle_pwr_constr(sdata,
1935                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1936                                 elems.pwr_constr_elem,
1937                                 elems.pwr_constr_elem_len);
1938         }
1939
1940         ieee80211_bss_info_change_notify(sdata, changed);
1941 }
1942
1943 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1944                                           struct sk_buff *skb)
1945 {
1946         struct ieee80211_local *local = sdata->local;
1947         struct ieee80211_mgmt *mgmt;
1948         u16 fc;
1949
1950         if (skb->len < 24)
1951                 return RX_DROP_MONITOR;
1952
1953         mgmt = (struct ieee80211_mgmt *) skb->data;
1954         fc = le16_to_cpu(mgmt->frame_control);
1955
1956         switch (fc & IEEE80211_FCTL_STYPE) {
1957         case IEEE80211_STYPE_PROBE_RESP:
1958         case IEEE80211_STYPE_BEACON:
1959         case IEEE80211_STYPE_AUTH:
1960         case IEEE80211_STYPE_ASSOC_RESP:
1961         case IEEE80211_STYPE_REASSOC_RESP:
1962         case IEEE80211_STYPE_DEAUTH:
1963         case IEEE80211_STYPE_DISASSOC:
1964         case IEEE80211_STYPE_ACTION:
1965                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1966                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1967                 return RX_QUEUED;
1968         }
1969
1970         return RX_DROP_MONITOR;
1971 }
1972
1973 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1974                                          struct sk_buff *skb)
1975 {
1976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1977         struct ieee80211_rx_status *rx_status;
1978         struct ieee80211_mgmt *mgmt;
1979         struct ieee80211_mgd_work *wk;
1980         enum rx_mgmt_action rma = RX_MGMT_NONE;
1981         u16 fc;
1982
1983         rx_status = (struct ieee80211_rx_status *) skb->cb;
1984         mgmt = (struct ieee80211_mgmt *) skb->data;
1985         fc = le16_to_cpu(mgmt->frame_control);
1986
1987         mutex_lock(&ifmgd->mtx);
1988
1989         if (ifmgd->associated &&
1990             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1991                                                         ETH_ALEN) == 0) {
1992                 switch (fc & IEEE80211_FCTL_STYPE) {
1993                 case IEEE80211_STYPE_BEACON:
1994                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1995                                                  rx_status);
1996                         break;
1997                 case IEEE80211_STYPE_PROBE_RESP:
1998                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1999                                                      skb->len, rx_status);
2000                         break;
2001                 case IEEE80211_STYPE_DEAUTH:
2002                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
2003                                                        mgmt, skb->len);
2004                         break;
2005                 case IEEE80211_STYPE_DISASSOC:
2006                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2007                         break;
2008                 case IEEE80211_STYPE_ACTION:
2009                         /* XXX: differentiate, can only happen for CSA now! */
2010                         ieee80211_sta_process_chanswitch(sdata,
2011                                         &mgmt->u.action.u.chan_switch.sw_elem,
2012                                         ifmgd->associated);
2013                         break;
2014                 }
2015                 mutex_unlock(&ifmgd->mtx);
2016
2017                 switch (rma) {
2018                 case RX_MGMT_NONE:
2019                         /* no action */
2020                         break;
2021                 case RX_MGMT_CFG80211_DEAUTH:
2022                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2023                         break;
2024                 case RX_MGMT_CFG80211_DISASSOC:
2025                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2026                         break;
2027                 default:
2028                         WARN(1, "unexpected: %d", rma);
2029                 }
2030                 goto out;
2031         }
2032
2033         list_for_each_entry(wk, &ifmgd->work_list, list) {
2034                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
2035                         continue;
2036
2037                 switch (fc & IEEE80211_FCTL_STYPE) {
2038                 case IEEE80211_STYPE_PROBE_RESP:
2039                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
2040                                                      rx_status);
2041                         break;
2042                 case IEEE80211_STYPE_AUTH:
2043                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
2044                         break;
2045                 case IEEE80211_STYPE_ASSOC_RESP:
2046                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2047                                                            skb->len, false);
2048                         break;
2049                 case IEEE80211_STYPE_REASSOC_RESP:
2050                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2051                                                            skb->len, true);
2052                         break;
2053                 case IEEE80211_STYPE_DEAUTH:
2054                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2055                                                        skb->len);
2056                         break;
2057                 }
2058                 /*
2059                  * We've processed this frame for that work, so it can't
2060                  * belong to another work struct.
2061                  * NB: this is also required for correctness because the
2062                  * called functions can free 'wk', and for 'rma'!
2063                  */
2064                 break;
2065         }
2066
2067         mutex_unlock(&ifmgd->mtx);
2068
2069         switch (rma) {
2070         case RX_MGMT_NONE:
2071                 /* no action */
2072                 break;
2073         case RX_MGMT_CFG80211_AUTH:
2074                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2075                 break;
2076         case RX_MGMT_CFG80211_ASSOC:
2077                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2078                 break;
2079         case RX_MGMT_CFG80211_DEAUTH:
2080                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2081                 break;
2082         case RX_MGMT_CFG80211_ASSOC_ERROR:
2083                 /* an internal error -- pretend timeout for now */
2084                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2085                 break;
2086         default:
2087                 WARN(1, "unexpected: %d", rma);
2088         }
2089
2090  out:
2091         kfree_skb(skb);
2092 }
2093
2094 static void ieee80211_sta_timer(unsigned long data)
2095 {
2096         struct ieee80211_sub_if_data *sdata =
2097                 (struct ieee80211_sub_if_data *) data;
2098         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2099         struct ieee80211_local *local = sdata->local;
2100
2101         if (local->quiescing) {
2102                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2103                 return;
2104         }
2105
2106         ieee80211_queue_work(&local->hw, &ifmgd->work);
2107 }
2108
2109 static void ieee80211_sta_work(struct work_struct *work)
2110 {
2111         struct ieee80211_sub_if_data *sdata =
2112                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2113         struct ieee80211_local *local = sdata->local;
2114         struct ieee80211_if_managed *ifmgd;
2115         struct sk_buff *skb;
2116         struct ieee80211_mgd_work *wk, *tmp;
2117         LIST_HEAD(free_work);
2118         enum rx_mgmt_action rma;
2119         bool anybusy = false;
2120
2121         if (!netif_running(sdata->dev))
2122                 return;
2123
2124         if (local->scanning)
2125                 return;
2126
2127         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2128                 return;
2129
2130         /*
2131          * ieee80211_queue_work() should have picked up most cases,
2132          * here we'll pick the the rest.
2133          */
2134         if (WARN(local->suspended, "STA MLME work scheduled while "
2135                  "going to suspend\n"))
2136                 return;
2137
2138         ifmgd = &sdata->u.mgd;
2139
2140         /* first process frames to avoid timing out while a frame is pending */
2141         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2142                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2143
2144         /* then process the rest of the work */
2145         mutex_lock(&ifmgd->mtx);
2146
2147         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2148                             IEEE80211_STA_CONNECTION_POLL) &&
2149             ifmgd->associated) {
2150                 u8 bssid[ETH_ALEN];
2151
2152                 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2153                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2154                         run_again(ifmgd, ifmgd->probe_timeout);
2155
2156                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2157 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2158                         printk(KERN_DEBUG "No probe response from AP %pM"
2159                                 " after %dms, try %d\n", bssid,
2160                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2161                                 ifmgd->probe_send_count);
2162 #endif
2163                         ieee80211_mgd_probe_ap_send(sdata);
2164                 } else {
2165                         /*
2166                          * We actually lost the connection ... or did we?
2167                          * Let's make sure!
2168                          */
2169                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2170                                           IEEE80211_STA_BEACON_POLL);
2171                         printk(KERN_DEBUG "No probe response from AP %pM"
2172                                 " after %dms, disconnecting.\n",
2173                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2174                         ieee80211_set_disassoc(sdata, true);
2175                         ieee80211_recalc_idle(local);
2176                         mutex_unlock(&ifmgd->mtx);
2177                         /*
2178                          * must be outside lock due to cfg80211,
2179                          * but that's not a problem.
2180                          */
2181                         ieee80211_send_deauth_disassoc(sdata, bssid,
2182                                         IEEE80211_STYPE_DEAUTH,
2183                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2184                                         NULL);
2185                         mutex_lock(&ifmgd->mtx);
2186                 }
2187         }
2188
2189
2190         ieee80211_recalc_idle(local);
2191
2192         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2193                 if (time_is_after_jiffies(wk->timeout)) {
2194                         /*
2195                          * This work item isn't supposed to be worked on
2196                          * right now, but take care to adjust the timer
2197                          * properly.
2198                          */
2199                         run_again(ifmgd, wk->timeout);
2200                         continue;
2201                 }
2202
2203                 switch (wk->state) {
2204                 default:
2205                         WARN_ON(1);
2206                         /* fall through */
2207                 case IEEE80211_MGD_STATE_IDLE:
2208                         /* nothing */
2209                         rma = RX_MGMT_NONE;
2210                         break;
2211                 case IEEE80211_MGD_STATE_PROBE:
2212                         rma = ieee80211_direct_probe(sdata, wk);
2213                         break;
2214                 case IEEE80211_MGD_STATE_AUTH:
2215                         rma = ieee80211_authenticate(sdata, wk);
2216                         break;
2217                 case IEEE80211_MGD_STATE_ASSOC:
2218                         rma = ieee80211_associate(sdata, wk);
2219                         break;
2220                 }
2221
2222                 switch (rma) {
2223                 case RX_MGMT_NONE:
2224                         /* no action required */
2225                         break;
2226                 case RX_MGMT_CFG80211_AUTH_TO:
2227                 case RX_MGMT_CFG80211_ASSOC_TO:
2228                         list_del(&wk->list);
2229                         list_add(&wk->list, &free_work);
2230                         wk->tries = rma; /* small abuse but only local */
2231                         break;
2232                 default:
2233                         WARN(1, "unexpected: %d", rma);
2234                 }
2235         }
2236
2237         list_for_each_entry(wk, &ifmgd->work_list, list) {
2238                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2239                         anybusy = true;
2240                         break;
2241                 }
2242         }
2243         if (!anybusy &&
2244             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2245                 ieee80211_queue_delayed_work(&local->hw,
2246                                              &local->scan_work,
2247                                              round_jiffies_relative(0));
2248
2249         mutex_unlock(&ifmgd->mtx);
2250
2251         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2252                 switch (wk->tries) {
2253                 case RX_MGMT_CFG80211_AUTH_TO:
2254                         cfg80211_send_auth_timeout(sdata->dev,
2255                                                    wk->bss->cbss.bssid);
2256                         break;
2257                 case RX_MGMT_CFG80211_ASSOC_TO:
2258                         cfg80211_send_assoc_timeout(sdata->dev,
2259                                                     wk->bss->cbss.bssid);
2260                         break;
2261                 default:
2262                         WARN(1, "unexpected: %d", wk->tries);
2263                 }
2264
2265                 list_del(&wk->list);
2266                 kfree(wk);
2267         }
2268
2269         ieee80211_recalc_idle(local);
2270 }
2271
2272 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2273 {
2274         struct ieee80211_sub_if_data *sdata =
2275                 (struct ieee80211_sub_if_data *) data;
2276         struct ieee80211_local *local = sdata->local;
2277
2278         if (local->quiescing)
2279                 return;
2280
2281         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2282 }
2283
2284 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2285 {
2286         struct ieee80211_sub_if_data *sdata =
2287                 (struct ieee80211_sub_if_data *) data;
2288         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2289         struct ieee80211_local *local = sdata->local;
2290
2291         if (local->quiescing)
2292                 return;
2293
2294         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2295 }
2296
2297 static void ieee80211_sta_monitor_work(struct work_struct *work)
2298 {
2299         struct ieee80211_sub_if_data *sdata =
2300                 container_of(work, struct ieee80211_sub_if_data,
2301                              u.mgd.monitor_work);
2302
2303         ieee80211_mgd_probe_ap(sdata, false);
2304 }
2305
2306 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2307 {
2308         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2309                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2310                                         IEEE80211_STA_CONNECTION_POLL);
2311
2312                 /* let's probe the connection once */
2313                 ieee80211_queue_work(&sdata->local->hw,
2314                            &sdata->u.mgd.monitor_work);
2315                 /* and do all the other regular work too */
2316                 ieee80211_queue_work(&sdata->local->hw,
2317                            &sdata->u.mgd.work);
2318         }
2319 }
2320
2321 #ifdef CONFIG_PM
2322 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2323 {
2324         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2325
2326         /*
2327          * we need to use atomic bitops for the running bits
2328          * only because both timers might fire at the same
2329          * time -- the code here is properly synchronised.
2330          */
2331
2332         cancel_work_sync(&ifmgd->work);
2333         cancel_work_sync(&ifmgd->beacon_loss_work);
2334         if (del_timer_sync(&ifmgd->timer))
2335                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2336
2337         cancel_work_sync(&ifmgd->chswitch_work);
2338         if (del_timer_sync(&ifmgd->chswitch_timer))
2339                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2340
2341         cancel_work_sync(&ifmgd->monitor_work);
2342         /* these will just be re-established on connection */
2343         del_timer_sync(&ifmgd->conn_mon_timer);
2344         del_timer_sync(&ifmgd->bcn_mon_timer);
2345 }
2346
2347 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2348 {
2349         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2350
2351         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2352                 add_timer(&ifmgd->timer);
2353         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2354                 add_timer(&ifmgd->chswitch_timer);
2355 }
2356 #endif
2357
2358 /* interface setup */
2359 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2360 {
2361         struct ieee80211_if_managed *ifmgd;
2362
2363         ifmgd = &sdata->u.mgd;
2364         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2365         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2366         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2367         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2368         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2369                     (unsigned long) sdata);
2370         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2371                     (unsigned long) sdata);
2372         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2373                     (unsigned long) sdata);
2374         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2375                     (unsigned long) sdata);
2376         skb_queue_head_init(&ifmgd->skb_queue);
2377
2378         INIT_LIST_HEAD(&ifmgd->work_list);
2379
2380         ifmgd->capab = WLAN_CAPABILITY_ESS;
2381         ifmgd->flags = 0;
2382         if (sdata->local->hw.queues >= 4)
2383                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2384
2385         mutex_init(&ifmgd->mtx);
2386
2387         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2388                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2389         else
2390                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2391 }
2392
2393 /* scan finished notification */
2394 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2395 {
2396         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2397
2398         /* Restart STA timers */
2399         rcu_read_lock();
2400         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2401                 ieee80211_restart_sta_timer(sdata);
2402         rcu_read_unlock();
2403 }
2404
2405 int ieee80211_max_network_latency(struct notifier_block *nb,
2406                                   unsigned long data, void *dummy)
2407 {
2408         s32 latency_usec = (s32) data;
2409         struct ieee80211_local *local =
2410                 container_of(nb, struct ieee80211_local,
2411                              network_latency_notifier);
2412
2413         mutex_lock(&local->iflist_mtx);
2414         ieee80211_recalc_ps(local, latency_usec);
2415         mutex_unlock(&local->iflist_mtx);
2416
2417         return 0;
2418 }
2419
2420 /* config hooks */
2421 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2422                        struct cfg80211_auth_request *req)
2423 {
2424         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2425         const u8 *ssid;
2426         struct ieee80211_mgd_work *wk;
2427         u16 auth_alg;
2428
2429         switch (req->auth_type) {
2430         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2431                 auth_alg = WLAN_AUTH_OPEN;
2432                 break;
2433         case NL80211_AUTHTYPE_SHARED_KEY:
2434                 auth_alg = WLAN_AUTH_SHARED_KEY;
2435                 break;
2436         case NL80211_AUTHTYPE_FT:
2437                 auth_alg = WLAN_AUTH_FT;
2438                 break;
2439         case NL80211_AUTHTYPE_NETWORK_EAP:
2440                 auth_alg = WLAN_AUTH_LEAP;
2441                 break;
2442         default:
2443                 return -EOPNOTSUPP;
2444         }
2445
2446         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2447         if (!wk)
2448                 return -ENOMEM;
2449
2450         wk->bss = (void *)req->bss;
2451
2452         if (req->ie && req->ie_len) {
2453                 memcpy(wk->ie, req->ie, req->ie_len);
2454                 wk->ie_len = req->ie_len;
2455         }
2456
2457         if (req->key && req->key_len) {
2458                 wk->key_len = req->key_len;
2459                 wk->key_idx = req->key_idx;
2460                 memcpy(wk->key, req->key, req->key_len);
2461         }
2462
2463         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2464         memcpy(wk->ssid, ssid + 2, ssid[1]);
2465         wk->ssid_len = ssid[1];
2466
2467         wk->state = IEEE80211_MGD_STATE_PROBE;
2468         wk->auth_alg = auth_alg;
2469         wk->timeout = jiffies; /* run right away */
2470
2471         /*
2472          * XXX: if still associated need to tell AP that we're going
2473          *      to sleep and then change channel etc.
2474          */
2475         sdata->local->oper_channel = req->bss->channel;
2476         ieee80211_hw_config(sdata->local, 0);
2477
2478         mutex_lock(&ifmgd->mtx);
2479         list_add(&wk->list, &sdata->u.mgd.work_list);
2480         mutex_unlock(&ifmgd->mtx);
2481
2482         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2483         return 0;
2484 }
2485
2486 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2487                         struct cfg80211_assoc_request *req)
2488 {
2489         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2490         struct ieee80211_mgd_work *wk, *found = NULL;
2491         int i, err;
2492
2493         mutex_lock(&ifmgd->mtx);
2494
2495         list_for_each_entry(wk, &ifmgd->work_list, list) {
2496                 if (&wk->bss->cbss == req->bss &&
2497                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2498                         found = wk;
2499                         break;
2500                 }
2501         }
2502
2503         if (!found) {
2504                 err = -ENOLINK;
2505                 goto out;
2506         }
2507
2508         list_del(&found->list);
2509
2510         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2511         if (!wk) {
2512                 list_add(&found->list, &ifmgd->work_list);
2513                 err = -ENOMEM;
2514                 goto out;
2515         }
2516
2517         list_add(&wk->list, &ifmgd->work_list);
2518
2519         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2520
2521         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2522                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2523                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2524                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2525                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2526
2527         sdata->local->oper_channel = req->bss->channel;
2528         ieee80211_hw_config(sdata->local, 0);
2529
2530         if (req->ie && req->ie_len) {
2531                 memcpy(wk->ie, req->ie, req->ie_len);
2532                 wk->ie_len = req->ie_len;
2533         } else
2534                 wk->ie_len = 0;
2535
2536         if (req->prev_bssid)
2537                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2538
2539         wk->state = IEEE80211_MGD_STATE_ASSOC;
2540         wk->tries = 0;
2541         wk->timeout = jiffies; /* run right away */
2542
2543         if (req->use_mfp) {
2544                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2545                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2546         } else {
2547                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2548                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2549         }
2550
2551         if (req->crypto.control_port)
2552                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2553         else
2554                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2555
2556         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2557
2558         err = 0;
2559
2560  out:
2561         mutex_unlock(&ifmgd->mtx);
2562         return err;
2563 }
2564
2565 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2566                          struct cfg80211_deauth_request *req,
2567                          void *cookie)
2568 {
2569         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2570         struct ieee80211_mgd_work *wk;
2571         const u8 *bssid = NULL;
2572         bool not_auth_yet = false;
2573
2574         mutex_lock(&ifmgd->mtx);
2575
2576         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2577                 bssid = req->bss->bssid;
2578                 ieee80211_set_disassoc(sdata, true);
2579         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2580                 if (&wk->bss->cbss == req->bss) {
2581                         bssid = req->bss->bssid;
2582                         if (wk->state == IEEE80211_MGD_STATE_PROBE)
2583                                 not_auth_yet = true;
2584                         list_del(&wk->list);
2585                         kfree(wk);
2586                         break;
2587                 }
2588         }
2589
2590         /*
2591          * If somebody requests authentication and we haven't
2592          * sent out an auth frame yet there's no need to send
2593          * out a deauth frame either. If the state was PROBE,
2594          * then this is the case. If it's AUTH we have sent a
2595          * frame, and if it's IDLE we have completed the auth
2596          * process already.
2597          */
2598         if (not_auth_yet) {
2599                 mutex_unlock(&ifmgd->mtx);
2600                 __cfg80211_auth_canceled(sdata->dev, bssid);
2601                 return 0;
2602         }
2603
2604         /*
2605          * cfg80211 should catch this ... but it's racy since
2606          * we can receive a deauth frame, process it, hand it
2607          * to cfg80211 while that's in a locked section already
2608          * trying to tell us that the user wants to disconnect.
2609          */
2610         if (!bssid) {
2611                 mutex_unlock(&ifmgd->mtx);
2612                 return -ENOLINK;
2613         }
2614
2615         mutex_unlock(&ifmgd->mtx);
2616
2617         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2618                sdata->name, bssid, req->reason_code);
2619
2620         ieee80211_send_deauth_disassoc(sdata, bssid,
2621                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2622                         cookie);
2623
2624         ieee80211_recalc_idle(sdata->local);
2625
2626         return 0;
2627 }
2628
2629 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2630                            struct cfg80211_disassoc_request *req,
2631                            void *cookie)
2632 {
2633         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2634
2635         mutex_lock(&ifmgd->mtx);
2636
2637         /*
2638          * cfg80211 should catch this ... but it's racy since
2639          * we can receive a disassoc frame, process it, hand it
2640          * to cfg80211 while that's in a locked section already
2641          * trying to tell us that the user wants to disconnect.
2642          */
2643         if (&ifmgd->associated->cbss != req->bss) {
2644                 mutex_unlock(&ifmgd->mtx);
2645                 return -ENOLINK;
2646         }
2647
2648         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2649                sdata->name, req->bss->bssid, req->reason_code);
2650
2651         ieee80211_set_disassoc(sdata, false);
2652
2653         mutex_unlock(&ifmgd->mtx);
2654
2655         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2656                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2657                         cookie);
2658
2659         ieee80211_recalc_idle(sdata->local);
2660
2661         return 0;
2662 }